I originally wanted to get an answer to my own question, but I see this phrase puzzles many of us. I have thought of a few easy phrases, since the purpose in medical interpreting is to be understood and convey the idea, orally, I would say, "administrador para dirigir pacientes." Some other phrases I have used "on the fly" are, la recepcionista que le puede entrevistar y dirigir mejor... etc. Dirigir is a word that I try to incorporate because a navigator "directs" people, and so it seems to be in line with the concept we are attempting to communicate.